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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1981d25ccae09a1e37aba7737fc67c0662871dc46002e52b77366c614e031d' 
  AND token = '+771D605n8PIHew6D4Cf8+9Og2hSfBXqD5fBdzmC+Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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