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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eeef9b6203b5003addb8e59a0278b09c6bdc5b31c35e2538f770702c8e0b47e' 
  AND token = 'NHPKs0hl8f/EYzRH94hwvTUqwj883H7yAUONNAlWDe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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