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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d7075802ad5649bff04d2ab948a0c2abc9b74bbed9ec72ddc1cc06324ffcc1' 
  AND token = '929YRrmgzfsbZ1x0o1fXGfJxS/EmZOmB8+BW6oNgfIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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