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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c88df82c2be5db9b4e0c4c5895f17e84dab81a71836fc5cebd5b4510a90fb28e' 
  AND token = 'TUW68Xgl/oFSANXNYHE+eF7boUPb5JaMwMdwLZhSbOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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