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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c708a07e5326f895bddbb60c2618b1b324a2691c506b941690ec10fd82b298e8' 
  AND token = 'EIdvv9T8UjUoXJTXzb/P4sHnx9VD8f59PuzzdwQ0M9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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