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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04df8edf4207f548cb15dfd1532d515b48a2fcb8eab568ae6273ffc49334102e' 
  AND token = '5smpXV7v8bqwiu/YFEDXGjFKtt9MUEkMCNV8BoI31p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}