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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3684e67de02908f5d80d704a96f1715264aadf213fa552e38cd62aa500650e63' 
  AND token = 'VIDZa2cPbs27HxlCl67KAKbW79E/3YCm0cBRQnM2Jtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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