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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba7d015e0107a1b4eee917b18c6a672727e6040b6c49f2af603d4c71ec824cc' 
  AND token = 'wMpBeAdteXTlRmBFNCh20Ajg6lq/sIs138DCia3H6Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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