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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1ca95cff36e5ae31535c9cb08e494d8c7b98981586f93e55a92800e2dec0ae0' 
  AND token = 'kCoAZIna6FlSWa5Pp51hPReVbFitPOcUCsDctW0emFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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