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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f32d43bc00a1c21d740ec52b9c81371a7fe4cffc9f4ab819e77a1e04b28c5e' 
  AND token = 'pxqjObqDTZx90f84pp0s0ljZ/GaNSLXGke2usR6CNrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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