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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ca6754f52cae62135e3b3bc5d34a1057ac54c144442e4d629cd96a172387729' 
  AND token = '+hS3eRzucbWqovWVcTgDQe41pxvQmqiYaxD5R+Ld2Gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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