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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e769d4a83fa175a7a1c7f5678a97deca7d181fdedaa1830b58f51627a6a55a' 
  AND token = 'Q1/TOGcecFHn6+475HNF6MCI4sP59Xzj8gihGd+fIN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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