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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5195973c7eb0d50d53865649450b79c41f8f2e79c1501a4d2545e50e93f148e6' 
  AND token = 'nLqr+g8tUVr3nx1DYBJ5+tAMVyHLVwkxS753Ih52UGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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