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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac6e60bf3a00cce21ef50b763cf4c2eb7e06ebdf820907fad662248d2b74189c' 
  AND token = 'anp8p86zcUKK54RYzGsQoQawSx8JDqBG/qWNtMjePfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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