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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '266e0bd388bad4452db96502bf54c862a2b896d78136e673e29bf549f759d650' 
  AND token = '3OTEDCukKh/ih/tDePZVApSd90WqSPo7pJaDbARC2zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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