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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d062bfa4f88f31da9f696623e9970e39c1e154af51dbfd41ef7d6f0ab5cef87' 
  AND token = 'StEgqwvbRR8niSbvoocb8uMlnO62/0F1yvwruafCrxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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