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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91326053c7c0f5a17abd32d7c197687504aaaeb29d4a0f430305d5f4784e197d' 
  AND token = 'R2OW2TgM+hU9/8ndwWfUKH/OxpZwIxIMpfdrrqFikcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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