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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b19638f02f01605d05b5cd58279e9efac4c2a1af73ec99249a97324926f9283f' 
  AND token = 'euYVbZ8QjZITRDGxfuR2HKvdEcNMUTtokDxt73+PWrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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