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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '072c0f962e823f5b77755e8b6c1c45a2e7dd94e77fab91958604f0ac9b9e88e6' 
  AND token = 'eypNhgNK8mnWg74167gi7qCARKEY2QlisqbzrLHE80k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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