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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d6e622eb5272bb210fc3e0b2748d534ba9dc2366f240ff028590c1179de430' 
  AND token = 'LynCWh/qCkDksNBtt2eG4JWGXvoc0DrK71YUhpfqhf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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