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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae1a91ee1968383e3ef7fa24e144191ac83967edd76216e706eec3d4abb3005' 
  AND token = 'u6p1n57h6NtoZf3t4c1hk7iFHM4nTwOzCQy3xQzGU4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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