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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ce0335b5bc2e278b2cb6d09cbddd4b6dc97e8c93635efbc4e47f7b6984e7299' 
  AND token = 'cAW28d1a33k+WR7o91iZh+jZMPGrMDvdQtCWYf3ckwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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