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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0567b2a72f4f3cfb3dcf50efe5c7ec3948c3e248a5f0470ee0d92e502f54c560' 
  AND token = 'tpDBTHIYW5k1YOEznEqS/3rriy4c6U1DJ6niA98OsC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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