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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e627941d396b2e723d2fed91f93ae0e8491e6246efbf1a879baffd1b2769e937' 
  AND token = '97hmpejix6i1VXRksTW6jzZPZzxjjz4gn8+HfMF4+2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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