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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '785be5307636661c89ef649180c0339820290fcebd8b9e9f26e310138c7adc08' 
  AND token = 'ucBpeD9Ea1uL2DerY/FUwN7jDId+fzDcakNniByIIwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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