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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7137d243b2faed294e05b5aa007c871d78597a6a49a42db3734bee0a34a2fa9' 
  AND token = 'mFfyxLQrLv3ydbsmeEMH6y31qzU+o0GT8+EtmAJOZyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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