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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd42e15ef03cdb357c5312c684a6354b4efcf5d45221b19eddf5665b3c0f20c1f' 
  AND token = 'do4aZq2mqNS8QQO4ZpvGdQlA5d5B5aerAfulCgFJ9Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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