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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b420775e0c1239e0b09e705ce894155c82b7e2e4997e8228ead0e40010ae17dc' 
  AND token = 'moUbLyylH/ptdJhiXzqfAx1Ww1iT5+q5Z3OkoFGi2e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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