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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb495ca0101d6b003d9efca3fbc33e240d20ad3aed3b91be9a0dab9aa1ef6f43' 
  AND token = 'T40lNZNNX/jNEPbn4V5YU9O3afRd04oFlmGDoq8Ale4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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