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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ade4f5b4c0022e79efa16885dc0d4e9d2dc0c3180afb9d74c7b482603bb7fce2' 
  AND token = 'CZ4j0vwE1mCzUmzzNwvy6isV8/7MYpHzlucn3U6lUD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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