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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '526200c07c1cf640ad1af5dc82d6fe140ff70457d4e51f6905697fcdb87891d0' 
  AND token = 'oQ/fKYSnmEcschsgFs8XQok5lFiM7D3xMrJNwX7Bl+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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