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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1301715e2e481c99736d33f3c4791b27643c05dd0e3327eb8915b951c3ebe5' 
  AND token = 'CxBOptqEb3oNGS9acmf+XaQU+muMtrnYVr8K15pBJDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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