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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc87ef11cf1653c9d3a92c12fff833889b9b2819a2be6d2fe99346bafce6ccb4' 
  AND token = 'lzVhCwYJdSHj2vnxGUDb0jIdSJEi8ba6057+o1sv7b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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