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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05122e883e72647ee3099c07ab68fade1fd7469f378414b2fc79567bc53c5aac' 
  AND token = 'FYwSey6r7MEWRohH8/G5Ps0bp2t3WlUSKLRzc4YJzl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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