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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b96f962a5c90dd52132b01b9eb274e82d117fbd7d524dfa9939dda7e8a7639' 
  AND token = 'Je4Pxe7G4cdJMMbqWsyXJ6eIBThDa28uo5B3ifHSjJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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