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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6ebc79d2912571f8cf77e0542058636428101cc0b674dfa25af1b9325a1b8ce' 
  AND token = '7VrCjGNBcocJm9Vkbg9d+Ief6hCSdkW5WD72vAq+Q5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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