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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbf9b0aff59af6fe48b4747fd7250ca2ff5549b3d42da61a66a97f55f5a77da5' 
  AND token = 'BLlNLwAooDE30NW8jxhJqkhXsIKrNzlTjUU0n/MPirA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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