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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ebaebd8c800a953f1d1268eaf26c25be1cdc3fdebccb262a78cb598a0826a71' 
  AND token = '/2vedgGl0Tq8BJ8C9RWKI6aaja0FpVM8mvzjqzpvUI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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