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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f42d40f4f3ac913fd66dde7d6ddc3c6df26e0b586eefd17d602161c9cc691f79' 
  AND token = 'tpNgf9Ojrx5kH2SP4pE5C4aU3cLFOet8AuR7disAAh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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