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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc8c28259083764d5684248e72ecda86243f02a38ca79c60eaa107bc5a5953ff' 
  AND token = 'bCDTtSkAkgqgrnbTovN2C0wDh80uq9Q0z0BJvx2s4k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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