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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a6b3cd04e5f1a5e81a0ae53a9663e5813f1c89cffa6749aea6294a0c8e693a0' 
  AND token = 'GX0HTWB41BODLxzBrq4sQ+mcHI6c8UUj6nlsH5DBx2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00128

JSON explain

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