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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada4de91b727052826f39cf676df4ce87356013974734f16604aba3cc13f97f3' 
  AND token = '1meu4PR+jhTF3yVEtczUP+K42Y5D76Gih5w2Kqb5CT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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