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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '948dbbcceff698dd192168d857bc6924fcbe99437608acfa8ca6913197bafee7' 
  AND token = '0mGtbCILlgRDDfIiUsQAgy1nyDoK4+Ftr2w23Cs/LyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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