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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff36dd510e16367781e61db648f6212d402aba2833eb54f134bd7f7c5423207b' 
  AND token = 'leYeG+ew9n7mzRpCwMck3bg+n1yMnvilK8euUHR51Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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