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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd94a3868adfd450417c3cbe8acb7b53ce1cd20f40ae7d308a96534bb3a6bb78' 
  AND token = 'dmByveoHMVvi5Z/xsaDsZ/C3AUcOAEGQP9cKlZ9SFKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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