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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '690974e27bd9a40503b765815e6e4e6df6c092e03f27443e07e15dbc4b9102f1' 
  AND token = '3Zj0ZdQAoSVv50zGJeb/fv187mnA0w5/1sNSVfGQefE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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