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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30450e95929e18f5888581d32748e01d84486da10d34c323f0baec0c140561d7' 
  AND token = 'NQ7d0dTnsyn6UUDwu/Nq9G2ad7TDDGQCJ59r9UEQilU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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