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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e522ba5552fd05f2016a1bd349db60f51fec59ced9efb2d39f36b5e8cd056584' 
  AND token = 'qXZ3P6JuoIC5ei9LSuMPTlSaTQmoJksKw5u0ErN5FOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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