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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5256f0a3e78467585ba31edbc671abb73f76fb3d40e0caa1fed584a13f60747b' 
  AND token = '5zLmhGeFyOV3kgZs3+4yVAMIq2N9ZvwT4dWFx14yilw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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