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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7399eb21a0c402e195a6e7bc468b52a16e45eee13b1c00a579089c798666810' 
  AND token = '7jYInQ+4aouJxOVcH2dJ1IZx8wOdVrP62xFF3uNN7pI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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