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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4977cf50cc8f12feff01b1ffbb60017ba90a6708d01805dc603ce1de774acd4a' 
  AND token = 'qlnlcIC7Rov1pJIXO0STEX6KxHp7WZSK1W+8vohsbqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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