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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '002efe3f7445eae70bd95c7ec7a514598e8734d75fd94a91fb07ba3559b326ec' 
  AND token = 'M+iyLXnTcPlSx3mfpR8cLMIPzoN+auqBGD4RG8SGB0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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