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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c6e440a9a6f6b678c34f9d8e694e854c9acb02d3274d4c04d0c4e2e8290e3f0' 
  AND token = 'zD+orydTJM5+r01p8ODj2guTfTo3J0qxjndM6gboovY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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