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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd83df86114825c639a5289b7ca2a9c6687bb043e9c01afaaef8f43273c6126c0' 
  AND token = 'xljmr9BEsU5kOCE7TK5jDd5Gb/Re7cNTGv0KYQnX43A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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